![Elementary Statistics: A Step By Step Approach](https://www.bartleby.com/isbn_cover_images/9781259755330/9781259755330_largeCoverImage.gif)
How Much Nicotine Is in Those Cigarettes?
A tobacco company claims that its best-selling cigarettes contain at most 40 mg of nicotine. This claim is tested at the 1% significance level by using the results of 15 randomly selected cigarettes. The
Sample mean = 42.6 | P-value = 0.008 |
Sample standard deviation = 3.7 | Significance level = 0.01 |
Test statistic t = 2.72155 | |
Degrees of freedom = 14 | Critical value t = 2.62449 |
1. What are the degrees of freedom?
2. Is this a z or t test?
3. Is this a comparison of one or two samples?
4. Is this a right-tailed, left-tailed, or two-tailed test?
5. From observing the P-value, what would you conclude?
6. By comparing the test statistic to the critical value, what would you conclude?
7. Is there a conflict in this output? Explain.
8. What has been proved in this study?
![Check Mark](/static/check-mark.png)
Want to see the full answer?
Check out a sample textbook solution![Blurred answer](/static/blurred-answer.jpg)
Chapter 8 Solutions
Elementary Statistics: A Step By Step Approach
- Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw Hill
![Text book image](https://www.bartleby.com/isbn_cover_images/9780079039897/9780079039897_smallCoverImage.jpg)